GB1499724A - Acoustic ducts - Google Patents

Acoustic ducts

Info

Publication number
GB1499724A
GB1499724A GB2762/75A GB276275A GB1499724A GB 1499724 A GB1499724 A GB 1499724A GB 2762/75 A GB2762/75 A GB 2762/75A GB 276275 A GB276275 A GB 276275A GB 1499724 A GB1499724 A GB 1499724A
Authority
GB
United Kingdom
Prior art keywords
duct
acoustic
gas turbine
lining
sound
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2762/75A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Publication of GB1499724A publication Critical patent/GB1499724A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F04D29/664—Sound attenuation by means of sound absorbing material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02K—JET-PROPULSION PLANTS
    • F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
    • F02K1/78—Other construction of jet pipes
    • F02K1/82—Jet pipe walls, e.g. liners
    • F02K1/827—Sound absorbing structures or liners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D33/00—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for
    • B64D33/02—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes
    • B64D2033/0206—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes comprising noise reduction means, e.g. acoustic liners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D33/00—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for
    • B64D33/02—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes
    • B64D2033/0266—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes specially adapted for particular type of power plants
    • B64D2033/0286—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes specially adapted for particular type of power plants for turbofan engines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/60—Efficient propulsion technologies, e.g. for aircraft

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Exhaust Silencers (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

1499724 Gas turbine ducted fan engines; acoustic ducts GENERAL ELECTRIC CO 22 Jan 1975 [15 Feb 1974] 2762/75 Headings F1B, F1C, F1G and F1J The invention relates to an acoustic duct and is described with reference to the fan duct of a gas turbine ducted fan engine. The duct has an asymmetric, peripherally discontinuous acoustic lining 20 attached to the inner surface thereof for absorbing sound propagating within the duct. The lining is so located as to alter the direction of sound emitted from the end of the duct and to obtain preferential enhanced suppression of sound in at least one pre-selected angular sector of the directional pattern. In the embodiment shown it is stated that with the acoustic lining at the upper 180 degrees arcuate surface of the duct noise suppression to an observer on the ground is enhanced. In a second embodiment the upper half of the inner surface is lined with one acoustic material 20 such as fibrous material and the lower half is lined with a second acoustic material 22 such as honeycomb, resonant chamber panel material, the first material having a higher sound absorption coefficient than the second material. In Fig. 5 which represents the exhaust duct of an industrial gas turbine plant, there are two arcuate strips 24a, 24b of the same acoustic material disposed at the lateral inner surfaces of the duct.
GB2762/75A 1974-02-15 1975-01-22 Acoustic ducts Expired GB1499724A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US442893A US3890060A (en) 1974-02-15 1974-02-15 Acoustic duct with asymmetric acoustical treatment

Publications (1)

Publication Number Publication Date
GB1499724A true GB1499724A (en) 1978-02-01

Family

ID=23758566

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2762/75A Expired GB1499724A (en) 1974-02-15 1975-01-22 Acoustic ducts

Country Status (7)

Country Link
US (1) US3890060A (en)
JP (1) JPS6010168B2 (en)
BE (1) BE825517A (en)
DE (1) DE2504073C2 (en)
FR (1) FR2261583B1 (en)
GB (1) GB1499724A (en)
IT (1) IT1031366B (en)

Families Citing this family (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1483590A (en) * 1973-12-27 1977-08-24 Chrysler Uk Fan assemblies
US4104002A (en) * 1976-12-02 1978-08-01 General Electric Company Spiral strip acoustic treatment
US4989886A (en) * 1988-12-30 1991-02-05 Textron Inc. Braided filamentary sealing element
US5029875A (en) * 1989-07-07 1991-07-09 Textron Inc. Fluid seal structure
JP2630652B2 (en) * 1989-08-09 1997-07-16 三菱電機ホーム機器株式会社 Blower
US5594218A (en) * 1995-01-04 1997-01-14 Northrop Grumman Corporation Anechoic chamber absorber and method
US5709529A (en) * 1995-11-14 1998-01-20 Westinghouse Electric Corporation Optimization of turbomachinery harmonics
US5702231A (en) * 1996-08-09 1997-12-30 The Boeing Company Apparatus and method for reducing noise emissions from a gas turbine engine inlet
FR2787513B1 (en) * 1998-12-17 2001-01-19 Turbomeca MULTICHANNEL EXHAUST DEVICE FOR ACOUSTICALLY TREATED TURBOMACHINE
SE515528C2 (en) * 1999-12-07 2001-08-20 Saab Ab Device for an acoustic absorbent
FR2820716B1 (en) 2001-02-15 2003-05-30 Eads Airbus Sa PROCESS FOR DEFROSTING BY FORCED CIRCULATION OF A FLUID, OF A REACTION ENGINE AIR INLET COVER AND DEVICE FOR ITS IMPLEMENTATION
FR2820715B1 (en) 2001-02-15 2003-05-30 Eads Airbus Sa PROCESS FOR DEFROSTING AN AIR INTAKE COVER OF A REACTION ENGINE AND DEVICE FOR IMPLEMENTING SAME
US6557799B1 (en) 2001-11-09 2003-05-06 The Boeing Company Acoustic treated thrust reverser bullnose fairing assembly
GB2385378B (en) * 2002-02-14 2005-08-31 Rolls Royce Plc Engine casing
FR2898870B1 (en) * 2006-03-24 2008-05-23 Aircelle Sa AIR INLET VIROLET STRUCTURE
GB0608236D0 (en) * 2006-04-26 2006-06-07 Rolls Royce Plc Aeroengine noise reduction
FR2905734B1 (en) * 2006-09-07 2012-07-13 Airbus France DEVICE FOR ENHANCING THE EFFICIENCY OF ACOUSTIC TREATMENTS IN A CONDUIT OF AN AIRCRAFT ENGINE
US8780550B2 (en) * 2006-09-26 2014-07-15 Hewlett-Packard Development Company, L.P. Dampening acoustic vibrations within an electronic system
US20080110695A1 (en) * 2006-11-15 2008-05-15 Mc Clellan W Thomas High efficiency, frequency-tunable, acoustic wool and method of attenuating acoustic vibrations
DE102007019762A1 (en) * 2007-04-25 2008-10-30 Eads Deutschland Gmbh Soundproofing device for a jet engine or a turbine
JP2009062977A (en) * 2007-08-15 2009-03-26 Rohr Inc Linear acoustic liner
FR2926704B1 (en) * 2008-01-25 2013-02-01 Velecta Paramount SILENCER FOR DRYING APPARATUS AND SILENT HAIR DRYER
DE102011006273A1 (en) 2011-03-28 2012-10-04 Rolls-Royce Deutschland Ltd & Co Kg Rotor of an axial compressor stage of a turbomachine
DE102011006275A1 (en) 2011-03-28 2012-10-04 Rolls-Royce Deutschland Ltd & Co Kg Stator of an axial compressor stage of a turbomachine
DE102011007767A1 (en) * 2011-04-20 2012-10-25 Rolls-Royce Deutschland Ltd & Co Kg flow machine
US8943792B2 (en) * 2011-06-29 2015-02-03 United Technologies Corporation Gas-driven propulsor with tip turbine fan
DE102011056826B4 (en) 2011-12-21 2014-06-26 Eads Deutschland Gmbh Soundproofing device and thus provided engine and method of providing
US9476385B2 (en) * 2012-11-12 2016-10-25 The Boeing Company Rotational annular airscrew with integrated acoustic arrester
EP4036388A1 (en) * 2013-02-26 2022-08-03 Raytheon Technologies Corporation Acoustic treatment to mitigate fan noise
EP2971659B1 (en) 2013-03-15 2021-09-22 Raytheon Technologies Corporation Acoustic liner with varied properties
WO2015023325A1 (en) * 2013-08-12 2015-02-19 United Technologies Corporation Non-axisymmetric fan flow path
US9850850B2 (en) * 2013-10-23 2017-12-26 Rohr, Inc. Acoustically treated thrust reverser track beam
DE102014006112A1 (en) * 2014-04-29 2015-10-29 Autogyro Ag aircraft
US10814966B2 (en) 2015-05-25 2020-10-27 Dotterel Technologies Limited Shroud for an aircraft
US9771868B2 (en) * 2015-07-21 2017-09-26 The Boeing Company Sound attenuation apparatus and method
US9587563B2 (en) 2015-07-21 2017-03-07 The Boeing Company Sound attenuation apparatus and method
US10823060B2 (en) * 2015-12-18 2020-11-03 Raytheon Technologies Corporation Gas turbine engine with short inlet, acoustic treatment and anti-icing features
US10161357B2 (en) 2016-06-17 2018-12-25 Rohr, Inc. Acoustically treated thrust reverser track beam
CN110997486A (en) 2017-07-24 2020-04-10 多特瑞尔技术有限公司 Protective cover
FR3078107B1 (en) * 2018-02-19 2020-07-31 Safran Aircraft Engines TURBOMACHINE NACELLE WITH ACOUSTICALLY POROUS WALLS
US11721352B2 (en) 2018-05-16 2023-08-08 Dotterel Technologies Limited Systems and methods for audio capture
DE102018116062A1 (en) * 2018-07-03 2020-01-09 Rolls-Royce Deutschland Ltd & Co Kg Structure assembly for a compressor of a turbomachine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2909235A (en) * 1955-11-03 1959-10-20 Gen Dynamics Corp Muffler
US3263771A (en) * 1964-05-21 1966-08-02 Seifert Kurt Sound absorbing pipe lining having packing with different densities
US3542152A (en) * 1968-04-08 1970-11-24 Gen Electric Sound suppression panel
FR1580553A (en) * 1968-07-26 1969-09-05
US3508838A (en) * 1968-09-16 1970-04-28 Gen Electric Sound suppression of compressors used in gas turbine engines
US3655008A (en) * 1971-01-28 1972-04-11 Rohr Corp Sound suppressing apparatus

Also Published As

Publication number Publication date
FR2261583A1 (en) 1975-09-12
DE2504073A1 (en) 1975-08-21
FR2261583B1 (en) 1981-02-13
JPS6010168B2 (en) 1985-03-15
DE2504073C2 (en) 1983-12-01
BE825517A (en) 1975-05-29
JPS50118114A (en) 1975-09-16
IT1031366B (en) 1979-04-30
US3890060A (en) 1975-06-17

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee